re: With all the headphone threads; does anyone use a portable amp?

Those little amps can make a huge difference, really. But it's always a question of bulk to me. I have a Fiio E6, which is just a cheap $27 headphone amp. It's really small, which I love. It really livens up the LG G4's weak onboard amp. I'd like to get something that is even stronger, though, which is why I'm expecting an LG V10 today (ESS onboard DAC that caters to the hifi dudes). Really hope that it's onboard amp is enough to drive my IEMs well without the need for a portable amp.